#include <iostream>
#include <cmath>
#include <cstdio>
using namespace std;

double f(double x,int n)
{
	if(n==1)
	return x/(1+x);
	else
	return x/(n+f(x,n-1));
}




int main()
{
  double x;
  int n;
  cin >> x >> n;
  cout << f(x,n) << endl;

}
